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| | Prehistory - Wikipedia, the free encyclopedia |
 | | Because, by definition, there are no written records from prehistoric times, the information we know about the time period is informed by the fields of palaeontology, astronomy, biology, geology, anthropology, archaeology, indeed all the natural sciences. |
 | | Until the arrival of humans, a geologic time scale defines periods in prehistory. |
 | | Prehistory can be said to date back to the beginning of the universe itself, although the term is most often used to describe periods when there was life on Earth; dinosaurs can be described as prehistoric animals and cavemen are described as prehistoric people. |
| en.wikipedia.org /wiki/Prehistory (502 words) |
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